/Engine/Source/Developer/Virtualization/Public/IVirtualizationBackend.h
Checks if a number of payload exists in the backends storage.
True if the operation completed without error, otherwise false
virtual bool DoPayloadsExist ( [TArrayView](API\Runtime\Core\Containers\TArrayView)< const [FIoHash](API\Runtime\Core\IO\FIoHash) > PayloadIds, [TArray](API\Runtime\Core\Containers\TArray)< bool > & OutResults )